Determining at.allow access | LinuC Level 1 102 Exam original practice question

1.08.2Basic

/etc/at.allow exists and lists only carol. /etc/at.deny lists dave.

Determine which ordinary user may use at.

Which statement is correct?

Hint 1: Focus on the scheduling model

Separate recurring schedules, one-time jobs, access-control files, and catch-up behavior before comparing the commands or settings.

Hint 2: Key terms

Review the short definitions of recurring schedules, one-time jobs, access-control files, and catch-up behavior involved.

at.allow: An access-control file whose listed users may use at when it exists.
at.deny: An access-control file that excludes listed users when at.allow is absent.
Allow-list precedence: The rule that an existing allow list limits at access to listed users.
At access control: The authorization check applied before a user can submit a one-time job.

Detailed explanation

Correctcarolだけが許可対象となる

Correct. carol is the only listed user in at.allow.

Incorrectdave以外の全員が許可対象となる

Incorrect. The allow file is present, so deny alone does not define access.

Incorrectcarolとdaveが許可対象となる

Incorrect. dave is not listed in allow.

Incorrect全員が拒否対象となる

Incorrect. carol is explicitly allowed.

An example you can run in a temporary verification environment.

printf '%s
' carol | grep -Fx carol

carol

Foundation review

A scheduler for recurring jobs described by a time-field table.

A scheduler for one-time jobs queued for a specified time.

A scheduler that can run periodic jobs after a system was unavailable.

Question IDKL-102-1049

EnvironmentPOSIX grep / 模擬一覧のみ

Last technical review2026-08-13

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